Lice are tiny insects that live on humans and survive by feeding on blood. When a large number of lice live and reproduce on a person, it is called an infestation. Lice are spread easily from one person to another through close bodily contact or through shared clothing or personal items (such as hats or hair brushes). They cannot jump or fly. Lice will not go away without proper treatment. In the meantime, they can be spread to other household members, sexual partners or other people you may come into close personal contact with. If you think you have lice, try a nonprescription product or call a health professional. More information: Lice